Controlling device for electromagnetic talking machines



z i Aug 1027 W. HORNAUER CONTROLLING DEVICE FQR ELECTROMAGNETIC TALKING MACHINES Filed June 20, 1925 perm Patented Aug. 16,1927.

UNITED STATES PATENT OFFICE WILLY HORNAUER, OFl N EUKOLLN, GERMANY, ASSIGNOB T TELEGMPmE-GEe. l ,SELLSCHAFT MIT yBESGHBNK'JJIEB. HAFTUNG SYSTEM STILLE, 0l BERLIN, GER- EANY.

CONTBOLLING DEVICE FOR ELECTBOMAGNETIC TALKING MACHINES.

applicationl 1aed :une 2o,

This invention relates to an electro-magnetic talkingfmachine of the Poulsen type in which the record is impressed magnetically on a steel wire which is fed from one spool 5 toy another and which asses between the oles of magnets that eit er receive impulses rom the wire and transform them by Ameans of a 4diaphragm into sound waves or, conversely, record received sound waves magnetically on the wire, a driving motor being employed to which either spool can be coupled by means of a' suitable clutch for taking up the wire.

The object of the present invention is to facilitate the control of the machine, and the invention consists in the provision l o clutches whereby both spool spindles are normally coupled to the riving mechanism so as to maintain the record wire taut, each clutch being controlled by a lever which, when depressed for releasing the clutch and the spool spindle, at the same time operates two electric circuits, one .for closing they magnet circuit and another for starting the driving mechanism.

Such a device is illustrated diagrammati# cally by way of'example in .the accompanying drawing in which the spools and their driving elements are shown in section.

The machine is fitted with two upright, rotatable spindles B and B which are mounted in bearings C, D and C', D respectively and adapted to receive for rotation the spools A and A on which the record wire F is wound. The spindles are driven by means of an electro-motor S from which motion is transmitted to ulleys G and G fitted loosely on the spin les. The pulleys are adjustable on the spindles so that they can be shifted in an axial direction into and out of engagement with friction discs L, L

which are fast on the spindles. `For this urpose the pulleys are controlled by levers gl and N which are pivoted4 respectively at M and M to the machine frame. In op-i eration, one spindle is coupled to the driving mechanism in this manner for taking up the wire, the other spindle being 'disengagec for delivering the wire. Normally, both ulleys are held in engagement vwith their riction discs by springs Q; and Q which bear 4for this purpose against the free ends of the levers N, N. Keys O, O are itted in the free ends of the levers so that they f T', U, and the springs T,

'tem, a record wire magnet system, spools carrying said wire,

l for releasing a. spindle,

1985,'Seria1 No. 38,556, and in Germany July 3, 1924.

. adapted to retain thelevers in operated position. The magnets which cooperate with the record wire F in recording and reproducinr the sound, are enerxgized by a battery E and contact springs ,W and V', W; whereby the circuit can be under the keys O, O so as to be actuated by the latter for closing the circuit. The circuit of the driving motor S is controlled by a similar set of contact s rings T, U and are connected tothe springs V, V so that both circuits will be closed when one of the keys is depressed.

When the machine is at rest, both spools A, A are coupled to the driving mechanism. To start the machine, the delivery spool must be released, and for this urpose the key appertaining to it must be epressed so as to occupy the position shown to the left in the drawing. The two switches will also be operated by the key so as to start the motor and so as to close the circuit of the magnet system E. As soon as the key is released from the catch R, the machine will be stopped and the magnet circuit broken while the driving pulley will be reengaged to its friction disc so as to keep the wire taut.

I claim:

1. An electro-magnetic talking-machine of closed, are arranged the character described, comprising a magnet system, an electric circuit for said syscooperating with said rotatable spindles carrying the spools, a driving mechanism for said spindles including said spindles are normally coupled to the driving mechanism, clutch-controlling members, and means whereby either of said clutch controlling members, when actuated causes the magnet circuit to be closed and the motor to be started. v

2. An electro-magnetic talking machine of the character described, comprising a magnet system, an electric circuit for said magnet system, a record wire cooperatingwith a motor, clutch'members whereby saidmagnet system, spools carrying said wire, spmdles carrying the s cols, clutch members secured to said spin les, driving pulleys arranged loosely on the spindles and adapted to engage said clutch members for driving the spindles, spring-pressed levers holding the pulleys normally 1n engagement with the clutch members, keys for operating said levers so as to release the pulleys, an electric driving motor, and switches arranged under said keys so as to be operated by the latter, when depressed for disengaging a pulley, for closing the magnet circuit and for starting the motor.

WILLY HORNAUER. 

